CN-116618654-B - Valve body processing technology of piston assembly and equipment used by valve body processing technology

Abstract

The invention provides a valve body processing technology of a piston assembly and equipment used by the valve body processing technology, and belongs to the technical field of shock absorbers. The invention adopts the powder metallurgy technology to manufacture the valve body, presses and sinters the blank powder to form the primary valve body, then carries out surface treatment on the primary valve body to obtain the valve body finished product, ensures the consistency of the processed valve body, eliminates the problems of pores, streamline and excessive impurities, has finer microstructure and higher quality, can also more accurately shape the size of the product, reduces or eliminates the machining amount, saves more materials, has better shock resistance and longer service life, is beneficial to the improvement of the service performance of the shock absorber, and also realizes the lifting of the bottom plate in the bottom die by arranging the structure with pressurizing equipment, the top die and the bottom die and simultaneously cooperates with the lifting wheel, can automatically eject the die body of the valve body to discharge the use requirement under the requirement of die body of the die assembly pressing valve body, has higher processing efficiency and is suitable for the mass production and manufacturing requirement of the valve body.

Inventors

• CAI YINGWEI

Assignees

• 宁波顺达粉末冶金工业有限公司

Dates

Publication Date

20260508

Application Date

20230410

Claims (5)

1. 1. A valve body machining apparatus of a piston assembly, characterized by being used by step S3 of a valve body machining process of a piston assembly, the valve body machining process of the piston assembly comprising the steps of: S1, preparing raw material powder; crushing a metal raw material to prepare metal powder; s2, preparing blank powder; Uniformly mixing different metal powders according to a preset proportion to prepare blank powder; s3, forming a die body; filling the blank powder into a forming die, starting pressurizing equipment, and pressing the blank powder in the forming die to form a die body of a valve body; S4, sintering; Placing the die body into a graphite boat, transferring the die body into a vacuum furnace, and sintering the die body to form a primary valve body; step S5, surface treatment; Placing the primary valve body into a steam environment for steam treatment, and waiting for an oxide film to be formed on the surface of the primary valve body to obtain a finished valve body; After the step S4 and before the step S5, detecting the shape, the size and the flatness of the primary valve body by using a detection tool; a temperature measuring hole penetrating through the wall body is formed in the outer wall of the graphite boat, a metal sleeve is arranged in the temperature measuring hole, and a metal plug is arranged in the metal sleeve; The valve body processing apparatus of the piston assembly includes: The device comprises a rack, wherein the rack is provided with an upper platform and a middle platform which are parallel to each other and are arranged at intervals, and the upper platform is positioned above the middle platform; The bottom dies are uniformly and alternately arranged on the middle platform, the bottom dies are arranged on the middle platform along a straight line direction, each bottom die comprises an outer die and a bottom plate, the bottom of each outer die is fixed on the middle platform and is provided with a cavity with an upper opening, a telescopic hole is formed in the outer die and in the center of the bottom wall of the cavity, the bottom plate is arranged in the cavity, and a telescopic rod is arranged at the bottom of the bottom plate, penetrates through the telescopic hole and then extends to the lower parts of the outer die and the middle platform; the top die is selectively matched with the bottom die, the top die selectively stretches into the cavity and slides in the cavity, meanwhile, a concave cavity and a convex column are formed in the bottom of the top die, concave holes corresponding to the convex column are formed in the bottom plate, and when the top die is pressed into the cavity, the lower ends of the convex columns are inserted into the concave holes; The pressurizing equipment is arranged on the upper platform in a sliding manner along the arrangement direction of the bottom die, the pressurizing equipment is provided with a vertically downward pressing rod, and one side of the top die, which is away from the bottom die, is fixedly arranged on the pressing rod; the conveyor belt is arranged on the middle platform and is arranged beside the bottom die along the arrangement direction of the bottom dies; the jacking wheels are rotatably arranged below the middle platform, are cams, correspond to the bottom die and are in contact with the lower ends of the telescopic rods; the telescopic hole is a stepped hole, a section with a large aperture of the telescopic hole is a guide hole, a section with a small aperture of the telescopic hole is a deflection hole, the guide hole is positioned on one side close to the bottom plate, the depth of the guide hole is larger than the thickness of a die body of the valve body, the aperture of the deflection hole is larger than the diameter of the telescopic rod, two symmetrically arranged guide grooves are formed in the hole wall of the deflection hole along the axial direction of the deflection hole, a guide sleeve is sleeved outside the telescopic rod at the bottom of the bottom plate and is slidably arranged in the guide hole, a deflection shaft penetrating along the radial direction of the guide shaft is arranged on the outer wall of one end, deviating from the bottom plate, of the telescopic rod, and two ends of the deflection shaft extend into the two guide grooves respectively; the telescopic device comprises a telescopic rod, and is characterized by further comprising a reset component, wherein the reset component comprises a tensioning spring and a limiting block, two ends of the tensioning spring are respectively and fixedly connected to the outer wall of the telescopic rod and the hole wall of the deflection hole, the tensioning spring is arranged along the radial direction of the telescopic rod and is mutually perpendicular to the deflection shaft, meanwhile, the tensioning spring is positioned in the direction opposite to the rotation direction of the jacking wheel of the telescopic rod, the limiting block is arranged on the hole wall of the deflection hole and is positioned on one side of the telescopic rod, provided with the tensioning spring, and the limiting block is in contact with the outer wall of the telescopic rod when the telescopic rod is vertically arranged.
2. 2. The valve body processing device of the piston assembly according to claim 1, wherein an electromagnet is embedded in the top die, the convex column is made of metal capable of being magnetically attracted or a permanent magnet is embedded in the upper end of the convex column, meanwhile, a positioning hole in flaring arrangement is formed in the bottom of the top die, and the positioning hole is located in the center position of the electromagnet.
3. 3. The valve body processing device of a piston assembly according to claim 1, further comprising a sliding driving assembly, wherein the sliding driving assembly is arranged between the upper platform and the pressurizing device, the sliding driving assembly comprises a driving screw rod, nuts, a sliding driver and a first speed reducer, both ends of the driving screw rod are rotatably installed on the upper platform and are arranged along the sliding direction of the pressurizing device, the nuts are sleeved outside the driving screw rod and are fixedly connected with the pressurizing device, the driving screw rod is in power connection with the first speed reducer, and the first speed reducer is in power connection with the sliding driver.
4. 4. The valve body processing apparatus of a piston assembly according to claim 3, further comprising a transmission assembly, wherein the transmission assembly comprises a transmission shaft, a driving shaft, a second speed reducer and a plurality of bevel gear transmission groups, the driving shaft is rotatably mounted below the middle platform along a direction parallel to the driving screw, each jacking wheel is fixedly sleeved on the driving shaft, the transmission shaft is arranged between the driving screw and the driving shaft, a group of bevel gear transmission groups is respectively arranged between two ends of the transmission shaft and the driving screw and between two ends of the driving shaft, and simultaneously, the driving shaft is also connected with the second speed reducer before being connected with the corresponding bevel gear transmission group.
5. 5. The valve body machining apparatus of a piston assembly according to claim 1, wherein the projections of adjacent two of the jacking wheels are offset from each other in the plane of rotation of the jacking wheels by an angle of 180 °.

Description

Valve body processing technology of piston assembly and equipment used by valve body processing technology Technical Field The invention relates to the technical field of shock absorbers, in particular to a valve body processing technology of a piston assembly and equipment used by the valve body processing technology. Background The shock absorber can restrain vibration and direct impact from the outside when the spring bounces after absorbing the shock through the action of the piston assembly in the cylinder body, and is widely applied to the automobile industry. The piston assembly is used as a core structure of the shock absorber and comprises a piston, a valve body and valve plates, wherein a plurality of through holes are formed in the piston, the plurality of through holes are divided into two groups, meanwhile, the two sides of the piston are respectively provided with the valve plates, one end opening of one group of through holes is covered by one valve plate, the other end opening of the other group of through holes is covered by the other valve plate, in addition, one side of each valve plate, which is away from the piston, is provided with the valve body, the existing valve body is of a cylindrical structure, the center of the valve body is provided with a center hole to be matched with a piston rod, a circle of annular protrusions are arranged on one end face of the valve body to realize directional positioning, the valve plates are pressed through the valve body, and deformation spaces are reserved for the valve plates, so that each group of through holes form a one-way conduction structure, and when the valve plates are impacted by the corresponding through holes in the cylinder body, the shock absorption medium in the cylinder body deforms, so that the shock absorption effect is achieved, and the service performance of the valve assembly is guaranteed. At present, the existing valve body in the market is of a casting structure, namely, the valve body is obtained by machining after casting and forming, and the valve body is simple in process, but air is easy to be retained in a die in the casting process, air bubbles are easy to occur, materials are not fully filled, impurities such as oxide skin and the like are easy to be mixed into fluid, defects such as streamline and pore are easy to occur, the quality is poor, the machining amount is large, and the material waste is serious. In addition, because the piston assembly needs frequent reciprocating movement in the cylinder body, the valve body can be frequently impacted by damping medium, the valve body is extremely easy to damage, the service life is short, and the service performance of the damper is affected. Disclosure of Invention The valve body processing technology of the piston assembly and equipment used by the valve body processing technology aims at solving the problems in the prior art, the valve body processing technology is manufactured by adopting a powder metallurgy technology, powder is filled into a die and then compacted and formed, then sintering and surface treatment are carried out, the valve body manufacturing is completed, the consistency of products is effectively ensured, the problems of pores, streamline and impurity mixing are eliminated, the microstructure is finer, the product quality is higher, in addition, the forming size is more accurate, no or only a small amount of machining amount is needed, the material is saved, the shock resistance is better, the service life is longer, the service performance of the shock absorber is ensured, in addition, the structure with a plurality of bottom dies and jacking wheels is arranged, the die bodies of the valve bodies can be sequentially pressed and formed, the die bodies of the valve bodies subjected to the pressing and forming can be ejected out of the bottom dies through the jacking wheels through a conveying belt to the subsequent sintering die, the processing efficiency is improved, and the requirement of mass production and manufacturing is met. The specific technical scheme is as follows: A valve body processing technology of a piston assembly comprises the following steps: S1, preparing raw material powder; crushing a metal raw material to prepare metal powder; s2, preparing blank powder; Uniformly mixing different metal powders according to a preset proportion to prepare blank powder; s3, forming a die body; filling the blank powder into a forming die, starting pressurizing equipment, and pressing the blank powder in the forming die to form a die body of the valve body; S4, sintering; placing the die body into a graphite boat, transferring the die body into a vacuum furnace, and sintering the die body to form a primary valve body; step S5, surface treatment; And (3) putting the primary valve body into a steam environment for steam treatment, and waiting for an oxide film to be formed on the surface of the primary valve body to obtain a finished valve body. In